- OpenAI has unveiled Daybreak, its latest security project
- It seeks to rival Anthropic’s Mythos in detecting and patching high-severity vulnerabilities
- Daybreak will also help companies build software more securely from the start
OpenAI has unveiled Daybreak, its response to Anthropic’s Mythos and Project Glasswing, sparking a potential cybersecurity arms race between the two companies.
“Daybreak combines the intelligence of OpenAI models, the extensibility of Codex as an agent harness, and our partners across the security flywheel to help make the world safer for everyone,” the announcement said.
The project looks to work with OpenAI’s industry and government partners by securing software at the very beginning of the development process, creating a more robust base that will eventually scale the effectiveness of cyber defenses.
Daybreak to build software securely from the ground up
In the blog post, OpenAI summarizes the project in a single sentence: “The goal is simple: accelerate cyber defenders and continuously secure software.”
Daybreak will allow organizations to apply OpenAI’s Codex Security to their own repository using an ‘agent harness’ where it will seek out, analyze and patch attack paths and high-impact code.
High-priority vulnerabilities can be analyzed and validated in a secure, isolated environment, “so teams can prioritize real, reproducible issues over noisy alerts.” Codex Security will also allow teams to automate detection and response, increasing efficiency and securing critical vulnerabilities faster.
Daybreak therefore seeks to delegate the rote work of identifying and analyzing to AI and to return the evidence-based findings of vulnerabilities to human teams. Where Daybreak differs in its approach from Mythos is in building software securely from the ground up and constantly monitoring for vulnerabilities, compared to Mythos’ focus on discovering and mitigating high-severity vulnerabilities at scale.
Daybreak includes three models; GPT-5.5, as standard for general work; GPT-5.5 with Trusted Access for Cyber, for use in defensive security workflows; and GPT-5.5-Cyber, for specialized workflows including red teaming and pen testing.
Dane Knecht, CTO at Cloudflare, said: “We’re excited about the potential of OpenAI’s cyber capabilities to bring stronger reasoning and more agentic execution into security workflows. It’s a big step forward for teams to be able to leverage frontier models to not only accelerate speed, but also improve their security posture.”
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